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The food is being served in the next room. | Mary said that the food is being served in the next room. → John thinks that the food is still there. Mary said that the food was being served in the next room. → John thinks that the food might be gone.
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| Mary said that she will go home at 10. → Mary did not go home yet, so he can still use the future tense. Mary said that she would go home at 10. → It is now after 10, so Mary is probably gone.
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I met the host of the party at work. | Mary said that she met the host of the party at work. → The situation has not changed, so John does not change the tense. |
| Mary said that she can’t find the drinks. → John knows that Mary is still looking for the drinks. Mary said that she couldn’t find the drinks. → John knows or thinks that Mary has found the drinks by now.
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| Mary said that she was happy to see me. → Mary saw John in the past so that feeling is over now. |
I am going to go into the other room. | Mary said that she is going to go into the other room. → Mary is still in this room. Mary said that she was going to go into the other room. → Mary is now in the other room (or John thinks so).
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I am hoping to see Margot tonight too. | Mary said that she is hoping to see Margot tonight too. → John knows that Mary still has not seen Margot. Mary said that she was hoping to see Margot tonight too. → John cannot see Mary anymore, so she might have found Margot since she spoke.
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